The instant invention relates to primary coating compositions that comprises a cationic polysaccharide, to be applied on a hydrophobic surface before a subsequent application of a polar or water based coating composition, such a as a paint or an adhesive.

The instant invention relates to primary coating compositions that comprises a cationic polysaccharide, to be applied on a hydrophobic surface before a subsequent application of a polar or water based coating composition, such a as a paint or an adhesive.

The invention relates to the use of non-ionic, insoluble cellulose ethers having 3-azido-2-hydroxypropyl (AHP) groups, which are linked to the cellulose via an ether link, wherein the molar substitution degree MSAHP is in the region of 0.001 to 0.30, for the production of insoluble, solid adhesives. The cellulose ethers substituted by AHP groups are reacted in the presence of a copper or ruthenium catalyst with alkine compounds, such as phenylacetylene, propargyl alcohol, propiolic acid or heterocyclic compounds, which have a substituent with a terminal alkine group. The reaction of the azide with the alkine occurs as a 1,3-dipolar cyclcoaddition reaction at room temperature within a few seconds, and an insoluble, solid adhesive is obtained. The adhesive is suitable in particular for adhering paper, cardboard or wood.